text: /*
   * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
   *           (C) 2000 Antti Koivisto (koivisto@kde.org)
   *           (C) 2000 Dirk Mueller (mueller@kde.org)
   *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
   * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
   * Copyright (C) 2009 Google Inc. All rights reserved.
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Library General Public
   * License as published by the Free Software Foundation; either
   * version 2 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Library General Public License for more details.
   *
   * You should have received a copy of the GNU Library General Public License
   * along with this library; see the file COPYING.LIB.  If not, write to
   * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   * Boston, MA 02110-1301, USA.
   *
   */
  
  #ifndef RenderObject_h
  #define RenderObject_h
  
  #include "core/dom/Document.h"
  #include "core/dom/DocumentLifecycle.h"
  #include "core/dom/Element.h"
  #include "core/editing/TextAffinity.h"
  #include "core/fetch/ImageResourceClient.h"
  #include "core/html/HTMLElement.h"
  #include "core/inspector/InspectorTraceEvents.h"
  #include "core/rendering/HitTestRequest.h"
  #include "core/rendering/PaintInvalidationState.h"
  #include "core/rendering/PaintPhase.h"
  #include "core/rendering/RenderObjectChildList.h"
  #include "core/rendering/ScrollAlignment.h"
  #include "core/rendering/SubtreeLayoutScope.h"
  #include "core/rendering/compositing/CompositingState.h"
  #include "core/rendering/compositing/CompositingTriggers.h"
  #include "core/rendering/style/RenderStyle.h"
  #include "core/rendering/style/StyleInheritedData.h"
  #include "platform/geometry/FloatQuad.h"
  #include "platform/geometry/LayoutRect.h"
  #include "platform/graphics/CompositingReasons.h"
  #include "platform/graphics/PaintInvalidationReason.h"
  #include "platform/graphics/paint/DisplayItem.h"
  #include "platform/transforms/TransformationMatrix.h"
  
  namespace blink {
  
  class AffineTransform;
  class Cursor;
  class Document;
  class HitTestLocation;
  class HitTestResult;
  class InlineBox;
  class Position;
  class PositionWithAffinity;
  class PseudoStyleRequest;
  class RenderBoxModelObject;
  class RenderBlock;
  class RenderFlowThread;
  class RenderGeometryMap;
  class RenderLayer;
  class RenderLayerModelObject;
  class RenderMultiColumnSpannerPlaceholder;
  class RenderView;
  class TransformState;
  
  struct PaintInfo;
  
  enum CursorDirective {
      SetCursorBasedOnStyle,
      SetCursor,
      DoNotSetCursor
  };
  
  enum HitTestFilter {
      HitTestAll,
      HitTestSelf,
      HitTestDescendants
  };
  
  enum HitTestAction {
      HitTestBlockBackground,
      HitTestChildBlockBackground,
      HitTestChildBlockBackgrounds,
      HitTestFloat,
      HitTestForeground
  };
  
  enum MarkingBehavior {
      MarkOnlyThis,
      MarkContainingBlockChain,
  };
  
  enum MapCoordinatesMode {
      IsFixed = 1 << 0,
      UseTransforms = 1 << 1,
      ApplyContainerFlip = 1 << 2,
      TraverseDocumentBoundaries = 1 << 3,
  };
  typedef unsigned MapCoordinatesFlags;
  
  const int caretWidth = 1;
  
  struct AnnotatedRegionValue {
      bool operator==(const AnnotatedRegionValue& o) const
      {
          return draggable == o.draggable && bounds == o.bounds;
      }
  
      LayoutRect bounds;
      bool draggable;
  };
  
  typedef WTF::HashMap<const RenderLayer*, Vector<LayoutRect> > LayerHitTestRects;
  
  #ifndef NDEBUG
  const int showTreeCharacterOffset = 39;
  #endif
  
  // Base class for all rendering tree objects.
  class RenderObject : public NoBaseWillBeGarbageCollectedFinalized<RenderObject>, public ImageResourceClient {
      friend class RenderBlock;
      friend class RenderBlockFlow;
      friend class RenderLayerReflectionInfo; // For setParent
      friend class RenderLayerScrollableArea; // For setParent.
      friend class RenderObjectChildList;
      WTF_MAKE_NONCOPYABLE(RenderObject);
  public:
      // Anonymous objects should pass the document as their node, and they will then automatically be
      // marked as anonymous in the constructor.
      explicit RenderObject(Node*);
      virtual ~RenderObject();
      virtual void trace(Visitor*);
  
      virtual const char* renderName() const = 0;
  
      String debugName() const;
  
      RenderObject* parent() const { return m_parent; }
      bool isDescendantOf(const RenderObject*) const;
  
      RenderObject* previousSibling() const { return m_previous; }
      RenderObject* nextSibling() const { return m_next; }
  
      RenderObject* slowFirstChild() const
      {
          if (const RenderObjectChildList* children = virtualChildren())
              return children->firstChild();
          return 0;
      }
      RenderObject* slowLastChild() const
      {
          if (const RenderObjectChildList* children = virtualChildren())
              return children->lastChild();
          return 0;
      }
  
      virtual RenderObjectChildList* virtualChildren() { return 0; }
      virtual const RenderObjectChildList* virtualChildren() const { return 0; }
  
      RenderObject* nextInPreOrder() const;
      RenderObject* nextInPreOrder(const RenderObject* stayWithin) const;
      RenderObject* nextInPreOrderAfterChildren() const;
      RenderObject* nextInPreOrderAfterChildren(const RenderObject* stayWithin) const;
      RenderObject* previousInPreOrder() const;
      RenderObject* previousInPreOrder(const RenderObject* stayWithin) const;
      RenderObject* childAt(unsigned) const;
  
      RenderObject* lastLeafChild() const;
  
      // The following six functions are used when the render tree hierarchy changes to make sure layers get
      // properly added and removed.  Since containership can be implemented by any subclass, and since a hierarchy
      // can contain a mixture of boxes and other object types, these functions need to be in the base class.
      RenderLayer* enclosingLayer() const;
      void addLayers(RenderLayer* parentLayer);
      void removeLayers(RenderLayer* parentLayer);
      void moveLayers(RenderLayer* oldParent, RenderLayer* newParent);
      RenderLayer* findNextLayer(RenderLayer* parentLayer, RenderObject* startPoint, bool checkParent = true);
  
      // Scrolling is a RenderBox concept, however some code just cares about recursively scrolling our enclosing ScrollableArea(s).
      bool scrollRectToVisible(const LayoutRect&, const ScrollAlignment& alignX = ScrollAlignment::alignCenterIfNeeded, const ScrollAlignment& alignY = ScrollAlignment::alignCenterIfNeeded);
  
      // Convenience function for getting to the nearest enclosing box of a RenderObject.
      RenderBox* enclosingBox() const;
      RenderBoxModelObject* enclosingBoxModelObject() const;
  
      RenderBox* enclosingScrollableBox() const;
  
      // Function to return our enclosing flow thread if we are contained inside one. This
      // function follows the containing block chain.
      RenderFlowThread* flowThreadContainingBlock() const
      {
          if (flowThreadState() == NotInsideFlowThread)
              return 0;
          return locateFlowThreadContainingBlock();
      }
  
  #if ENABLE(ASSERT)
      void setHasAXObject(bool flag) { m_hasAXObject = flag; }
      bool hasAXObject() const { return m_hasAXObject; }
  
      // Helper class forbidding calls to setNeedsLayout() during its lifetime.
      class SetLayoutNeededForbiddenScope {
      public:
          explicit SetLayoutNeededForbiddenScope(RenderObject&);
          ~SetLayoutNeededForbiddenScope();
      private:
          RenderObject& m_renderObject;
          bool m_preexistingForbidden;
      };
  
      void assertRendererLaidOut() const
      {
  #ifndef NDEBUG
          if (needsLayout())
              showRenderTreeForThis();
  #endif
          ASSERT_WITH_SECURITY_IMPLICATION(!needsLayout());
      }
  
      void assertSubtreeIsLaidOut() const
      {
          for (const RenderObject* renderer = this; renderer; renderer = renderer->nextInPreOrder())
              renderer->assertRendererLaidOut();
      }
  
      void assertRendererClearedPaintInvalidationState() const
      {
  #ifndef NDEBUG
          if (paintInvalidationStateIsDirty()) {
              showRenderTreeForThis();
              ASSERT_NOT_REACHED();
          }
  #endif
      }
  
      void assertSubtreeClearedPaintInvalidationState() const
      {
          for (const RenderObject* renderer = this; renderer; renderer = renderer->nextInPreOrder())
              renderer->assertRendererClearedPaintInvalidationState();
      }
  
  #endif
  
      // FIXME: This could be used when changing the size of a renderer without children to skip some invalidations.
      bool rendererHasNoBoxEffect() const
      {
          return !style()->hasVisualOverflowingEffect() && !style()->hasBorder() && !style()->hasBackground();
      }
  
      // Obtains the nearest enclosing block (including this block) that contributes a first-line style to our inline
      // children.
      virtual RenderBlock* firstLineBlock() const;
  
      // Called when an object that was floating or positioned becomes a normal flow object
      // again.  We have to make sure the render tree updates as needed to accommodate the new
      // normal flow object.
      void handleDynamicFloatPositionChange();
  
      // RenderObject tree manipulation
      //////////////////////////////////////////
      virtual bool canHaveChildren() const { return virtualChildren(); }
      virtual bool canHaveGeneratedChildren() const;
      virtual bool isChildAllowed(RenderObject*, RenderStyle*) const { return true; }
      virtual void addChild(RenderObject* newChild, RenderObject* beforeChild = 0);
      virtual void addChildIgnoringContinuation(RenderObject* newChild, RenderObject* beforeChild = 0) { return addChild(newChild, beforeChild); }
      virtual void removeChild(RenderObject*);
      virtual bool createsAnonymousWrapper() const { return false; }
      //////////////////////////////////////////
  
  protected:
      //////////////////////////////////////////
      // Helper functions. Dangerous to use!
      void setPreviousSibling(RenderObject* previous) { m_previous = previous; }
      void setNextSibling(RenderObject* next) { m_next = next; }
      void setParent(RenderObject* parent)
      {
          m_parent = parent;
  
          // Only update if our flow thread state is different from our new parent and if we're not a RenderFlowThread.
          // A RenderFlowThread is always considered to be inside itself, so it never has to change its state
          // in response to parent changes.
          FlowThreadState newState = parent ? parent->flowThreadState() : NotInsideFlowThread;
          if (newState != flowThreadState() && !isRenderFlowThread())
              setFlowThreadStateIncludingDescendants(newState);
      }
  
      //////////////////////////////////////////
  private:
  #if ENABLE(ASSERT)
      bool isSetNeedsLayoutForbidden() const { return m_setNeedsLayoutForbidden; }
      void setNeedsLayoutIsForbidden(bool flag) { m_setNeedsLayoutForbidden = flag; }
  #endif
  
      void addAbsoluteRectForLayer(LayoutRect& result);
      bool requiresAnonymousTableWrappers(const RenderObject*) const;
  
      // Gets pseudoStyle from Shadow host(in case of input elements)
      // or from Parent element.
      PassRefPtr<RenderStyle> getUncachedPseudoStyleFromParentOrShadowHost() const;
  
      bool skipInvalidationWhenLaidOutChildren() const;
  
  public:
  #ifndef NDEBUG
      void showTreeForThis() const;
      void showRenderTreeForThis() const;
      void showLineTreeForThis() const;
  
      void showRenderObject() const;
      // We don't make printedCharacters an optional parameter so that
      // showRenderObject can be called from gdb easily.
      void showRenderObject(int printedCharacters) const;
      void showRenderTreeAndMark(const RenderObject* markedObject1 = 0, const char* markedLabel1 = 0, const RenderObject* markedObject2 = 0, const char* markedLabel2 = 0, int depth = 0) const;
  #endif
  
      static RenderObject* createObject(Element*, RenderStyle*);
      static unsigned instanceCount() { return s_instanceCount; }
  
  #if !ENABLE(OILPAN)
      // RenderObjects are allocated out of the rendering partition.
      void* operator new(size_t);
      void operator delete(void*);
  #endif
  
  public:
      bool isPseudoElement() const { return node() && node()->isPseudoElement(); }
  
      virtual bool isBoxModelObject() const { return false; }
      bool isBR() const { return isOfType(RenderObjectBr); }
      bool isCanvas() const { return isOfType(RenderObjectCanvas); }
      bool isCounter() const { return isOfType(RenderObjectCounter); }
      bool isDetailsMarker() const { return isOfType(RenderObjectDetailsMarker); }
      bool isEmbeddedObject() const { return isOfType(RenderObjectEmbeddedObject); }
      bool isFieldset() const { return isOfType(RenderObjectFieldset); }
      bool isFileUploadControl() const { return isOfType(RenderObjectFileUploadControl); }
      bool isFrame() const { return isOfType(RenderObjectFrame); }
      bool isFrameSet() const { return isOfType(RenderObjectFrameSet); }
      bool isLayoutTableCol() const { return isOfType(RenderObjectLayoutTableCol); }
      bool isListBox() const { return isOfType(RenderObjectListBox); }
      bool isListItem() const { return isOfType(RenderObjectListItem); }
      bool isListMarker() const { return isOfType(RenderObjectListMarker); }
      bool isMedia() const { return isOfType(RenderObjectMedia); }
      bool isMenuList() const { return isOfType(RenderObjectMenuList); }
      bool isMeter() const { return isOfType(RenderObjectMeter); }
      bool isProgress() const { return isOfType(RenderObjectProgress); }
      bool isQuote() const { return isOfType(RenderObjectQuote); }
      bool isRenderButton() const { return isOfType(RenderObjectRenderButton); }
      bool isRenderFullScreen() const { return isOfType(RenderObjectRenderFullScreen); }
      bool isRenderFullScreenPlaceholder() const { return isOfType(RenderObjectRenderFullScreenPlaceholder); }
      bool isRenderGrid() const { return isOfType(RenderObjectRenderGrid); }
      bool isRenderIFrame() const { return isOfType(RenderObjectRenderIFrame); }
      bool isRenderImage() const { return isOfType(RenderObjectRenderImage); }
      bool isRenderMultiColumnSet() const { return isOfType(RenderObjectRenderMultiColumnSet); }
      bool isRenderMultiColumnSpannerPlaceholder() const { return isOfType(RenderObjectRenderMultiColumnSpannerPlaceholder); }
      bool isRenderRegion() const { return isOfType(RenderObjectRenderRegion); }
      bool isRenderScrollbarPart() const { return isOfType(RenderObjectRenderScrollbarPart); }
      bool isRenderView() const { return isOfType(RenderObjectRenderView); }
      bool isReplica() const { return isOfType(RenderObjectReplica); }
      bool isRuby() const { return isOfType(RenderObjectRuby); }
      bool isRubyBase() const { return isOfType(RenderObjectRubyBase); }
      bool isRubyRun() const { return isOfType(RenderObjectRubyRun); }
      bool isRubyText() const { return isOfType(RenderObjectRubyText); }
      bool isSlider() const { return isOfType(RenderObjectSlider); }
      bool isSliderThumb() const { return isOfType(RenderObjectSliderThumb); }
      bool isTable() const { return isOfType(RenderObjectTable); }
      bool isTableCaption() const { return isOfType(RenderObjectTableCaption); }
      bool isTableCell() const { return isOfType(RenderObjectTableCell); }
      bool isTableRow() const { return isOfType(RenderObjectTableRow); }
      bool isTableSection() const { return isOfType(RenderObjectTableSection); }
      bool isTextArea() const { return isOfType(RenderObjectTextArea); }
      bool isTextControl() const { return isOfType(RenderObjectTextControl); }
      bool isTextField() const { return isOfType(RenderObjectTextField); }
      bool isVideo() const { return isOfType(RenderObjectVideo); }
      bool isWidget() const { return isOfType(RenderObjectWidget); }
  
      virtual bool isImage() const { return false; }
  
      virtual bool isInlineBlockOrInlineTable() const { return false; }
      virtual bool isLayerModelObject() const { return false; }
      virtual bool isRenderBlock() const { return false; }
      virtual bool isRenderBlockFlow() const { return false; }
      virtual bool isRenderFlowThread() const { return false; }
      virtual bool isRenderInline() const { return false; }
      virtual bool isRenderPart() const { return false; }
  
      bool isDocumentElement() const { return document().documentElement() == m_node; }
      // isBody is called from RenderBox::styleWillChange and is thus quite hot.
      bool isBody() const { return node() && node()->hasTagName(HTMLNames::bodyTag); }
      bool isHR() const;
      bool isLegend() const;
  
      bool isTablePart() const { return isTableCell() || isLayoutTableCol() || isTableCaption() || isTableRow() || isTableSection(); }
  
      inline bool isBeforeContent() const;
      inline bool isAfterContent() const;
      inline bool isBeforeOrAfterContent() const;
      static inline bool isAfterContent(const RenderObject* obj) { return obj && obj->isAfterContent(); }
  
      bool hasCounterNodeMap() const { return m_bitfields.hasCounterNodeMap(); }
      void setHasCounterNodeMap(bool hasCounterNodeMap) { m_bitfields.setHasCounterNodeMap(hasCounterNodeMap); }
      bool everHadLayout() const { return m_bitfields.everHadLayout(); }
  
      bool childrenInline() const { return m_bitfields.childrenInline(); }
      void setChildrenInline(bool b) { m_bitfields.setChildrenInline(b); }
      bool hasColumns() const { return m_bitfields.hasColumns(); }
      void setHasColumns(bool b = true) { m_bitfields.setHasColumns(b); }
  
      bool alwaysCreateLineBoxesForRenderInline() const
      {
          ASSERT(isRenderInline());
          return m_bitfields.alwaysCreateLineBoxesForRenderInline();
      }
      void setAlwaysCreateLineBoxesForRenderInline(bool alwaysCreateLineBoxes)
      {
          ASSERT(isRenderInline());
          m_bitfields.setAlwaysCreateLineBoxesForRenderInline(alwaysCreateLineBoxes);
      }
  
      bool ancestorLineBoxDirty() const { return m_bitfields.ancestorLineBoxDirty(); }
      void setAncestorLineBoxDirty(bool value = true)
      {
          m_bitfields.setAncestorLineBoxDirty(value);
          if (value)
              setNeedsLayoutAndFullPaintInvalidation();
      }
  
      enum FlowThreadState {
          NotInsideFlowThread = 0,
          InsideOutOfFlowThread = 1,
          InsideInFlowThread = 2,
      };
  
      void setFlowThreadStateIncludingDescendants(FlowThreadState);
  
      FlowThreadState flowThreadState() const { return m_bitfields.flowThreadState(); }
      void setFlowThreadState(FlowThreadState state) { m_bitfields.setFlowThreadState(state); }
  
      // FIXME: Until all SVG renders can be subclasses of RenderSVGModelObject we have
      // to add SVG renderer methods to RenderObject with an ASSERT_NOT_REACHED() default implementation.
      bool isSVG() const { return isOfType(RenderObjectSVG); }
      bool isSVGRoot() const { return isOfType(RenderObjectSVGRoot); }
      bool isSVGContainer() const { return isOfType(RenderObjectSVGContainer); }
      bool isSVGTransformableContainer() const { return isOfType(RenderObjectSVGTransformableContainer); }
      bool isSVGViewportContainer() const { return isOfType(RenderObjectSVGViewportContainer); }
      bool isSVGGradientStop() const { return isOfType(RenderObjectSVGGradientStop); }
      bool isSVGHiddenContainer() const { return isOfType(RenderObjectSVGHiddenContainer); }
      bool isSVGShape() const { return isOfType(RenderObjectSVGShape); }
      bool isSVGText() const { return isOfType(RenderObjectSVGText); }
      bool isSVGTextPath() const { return isOfType(RenderObjectSVGTextPath); }
      bool isSVGInline() const { return isOfType(RenderObjectSVGInline); }
      bool isSVGInlineText() const { return isOfType(RenderObjectSVGInlineText); }
      bool isSVGImage() const { return isOfType(RenderObjectSVGImage); }
      bool isSVGForeignObject() const { return isOfType(RenderObjectSVGForeignObject); }
      bool isSVGResourceContainer() const { return isOfType(RenderObjectSVGResourceContainer); }
      bool isSVGResourceFilter() const { return isOfType(RenderObjectSVGResourceFilter); }
      bool isSVGResourceFilterPrimitive() const { return isOfType(RenderObjectSVGResourceFilterPrimitive); }
  
      // FIXME: Those belong into a SVG specific base-class for all renderers (see above)
      // Unfortunately we don't have such a class yet, because it's not possible for all renderers
      // to inherit from RenderSVGObject -> RenderObject (some need RenderBlock inheritance for instance)
      virtual void setNeedsTransformUpdate() { }
      virtual void setNeedsBoundariesUpdate();
  
      bool isBlendingAllowed() const { return !isSVG() || (isSVGContainer() && !isSVGHiddenContainer()) || isSVGShape() || isSVGImage() || isSVGText(); }
      virtual bool hasNonIsolatedBlendingDescendants() const { return false; }
      enum DescendantIsolationState {
          DescendantIsolationRequired,
          DescendantIsolationNeedsUpdate,
      };
      virtual void descendantIsolationRequirementsChanged(DescendantIsolationState) { }
  
      // Per SVG 1.1 objectBoundingBox ignores clipping, masking, filter effects, opacity and stroke-width.
      // This is used for all computation of objectBoundingBox relative units and by SVGLocatable::getBBox().
      // NOTE: Markers are not specifically ignored here by SVG 1.1 spec, but we ignore them
      // since stroke-width is ignored (and marker size can depend on stroke-width).
      // objectBoundingBox is returned local coordinates.
      // The name objectBoundingBox is taken from the SVG 1.1 spec.
      virtual FloatRect objectBoundingBox() const;
      virtual FloatRect strokeBoundingBox() const;
  
      // Returns the smallest rectangle enclosing all of the painted content
      // respecting clipping, masking, filters, opacity, stroke-width and markers
      virtual FloatRect paintInvalidationRectInLocalCoordinates() const;
  
      // This only returns the transform="" value from the element
      // most callsites want localToParentTransform() instead.
      virtual AffineTransform localTransform() const;
  
      // Returns the full transform mapping from local coordinates to local coords for the parent SVG renderer
      // This includes any viewport transforms and x/y offsets as well as the transform="" value off the element.
      virtual const AffineTransform& localToParentTransform() const;
  
      // SVG uses FloatPoint precise hit testing, and passes the point in parent
      // coordinates instead of in paint invalidaiton container coordinates. Eventually the
      // rest of the rendering tree will move to a similar model.
      virtual bool nodeAtFloatPoint(const HitTestRequest&, HitTestResult&, const FloatPoint& pointInParent, HitTestAction);
  
      bool isAnonymous() const { return m_bitfields.isAnonymous(); }
      bool isAnonymousBlock() const
      {
          // This function is kept in sync with anonymous block creation conditions in
          // RenderBlock::createAnonymousBlock(). This includes creating an anonymous
          // RenderBlock having a BLOCK or BOX display. Other classes such as RenderTextFragment
          // are not RenderBlocks and will return false. See https://bugs.webkit.org/show_bug.cgi?id=56709.
          return isAnonymous() && (style()->display() == BLOCK || style()->display() == BOX) && style()->styleType() == NOPSEUDO && isRenderBlock() && !isListMarker() && !isRenderFlowThread() && !isRenderMultiColumnSet()
              && !isRenderFullScreen()
              && !isRenderFullScreenPlaceholder();
      }
      bool isAnonymousColumnsBlock() const { return style()->specifiesColumns() && isAnonymousBlock(); }
      bool isAnonymousColumnSpanBlock() const { return style()->columnSpan() && isAnonymousBlock(); }
      bool isElementContinuation() const { return node() && node()->renderer() != this; }
      bool isInlineElementContinuation() const { return isElementContinuation() && isInline(); }
      virtual RenderBoxModelObject* virtualContinuation() const { return 0; }
  
      bool isFloating() const { return m_bitfields.floating(); }
  
      bool isOutOfFlowPositioned() const { return m_bitfields.isOutOfFlowPositioned(); } // absolute or fixed positioning
      bool isRelPositioned() const { return m_bitfields.isRelPositioned(); } // relative positioning
      bool isPositioned() const { return m_bitfields.isPositioned(); }
  
      bool isText() const  { return m_bitfields.isText(); }
      bool isBox() const { return m_bitfields.isBox(); }
      bool isInline() const { return m_bitfields.isInline(); } // inline object
      bool isDragging() const { return m_bitfields.isDragging(); }
      bool isReplaced() const { return m_bitfields.isReplaced(); } // a "replaced" element (see CSS)
      bool isHorizontalWritingMode() const { return m_bitfields.horizontalWritingMode(); }
      bool hasFlippedBlocksWritingMode() const
      {
          return style()->isFlippedBlocksWritingMode();
      }
  
      bool hasLayer() const { return m_bitfields.hasLayer(); }
  
      // "Box decoration background" includes all box decorations and backgrounds
      // that are painted as the background of the object. It includes borders,
      // box-shadows, background-color and background-image, etc.
      enum BoxDecorationBackgroundState {
          NoBoxDecorationBackground,
          HasBoxDecorationBackgroundObscurationStatusInvalid,
          HasBoxDecorationBackgroundKnownToBeObscured,
          HasBoxDecorationBackgroundMayBeVisible,
      };
      bool hasBoxDecorationBackground() const { return m_bitfields.boxDecorationBackgroundState() != NoBoxDecorationBackground; }
      bool boxDecorationBackgroundIsKnownToBeObscured();
      bool canRenderBorderImage() const;
      bool mustInvalidateBackgroundOrBorderPaintOnWidthChange() const;
      bool mustInvalidateBackgroundOrBorderPaintOnHeightChange() const;
      bool mustInvalidateFillLayersPaintOnWidthChange(const FillLayer&) const;
      bool mustInvalidateFillLayersPaintOnHeightChange(const FillLayer&) const;
      bool hasBackground() const { return style()->hasBackground(); }
      bool hasEntirelyFixedBackground() const;
  
      bool needsLayoutBecauseOfChildren() const { return needsLayout() && !selfNeedsLayout() && !needsPositionedMovementLayout() && !needsSimplifiedNormalFlowLayout(); }
  
      bool needsLayout() const
      {
          return m_bitfields.selfNeedsLayout() || m_bitfields.normalChildNeedsLayout() || m_bitfields.posChildNeedsLayout()
              || m_bitfields.needsSimplifiedNormalFlowLayout() || m_bitfields.needsPositionedMovementLayout();
      }
  
      bool selfNeedsLayout() const { return m_bitfields.selfNeedsLayout(); }
      bool needsPositionedMovementLayout() const { return m_bitfields.needsPositionedMovementLayout(); }
      bool needsPositionedMovementLayoutOnly() const
      {
          return m_bitfields.needsPositionedMovementLayout() && !m_bitfields.selfNeedsLayout() && !m_bitfields.normalChildNeedsLayout()
              && !m_bitfields.posChildNeedsLayout() && !m_bitfields.needsSimplifiedNormalFlowLayout();
      }
  
      bool posChildNeedsLayout() const { return m_bitfields.posChildNeedsLayout(); }
      bool needsSimplifiedNormalFlowLayout() const { return m_bitfields.needsSimplifiedNormalFlowLayout(); }
      bool normalChildNeedsLayout() const { return m_bitfields.normalChildNeedsLayout(); }
  
      bool preferredLogicalWidthsDirty() const { return m_bitfields.preferredLogicalWidthsDirty(); }
  
      bool needsOverflowRecalcAfterStyleChange() const { return m_bitfields.selfNeedsOverflowRecalcAfterStyleChange() || m_bitfields.childNeedsOverflowRecalcAfterStyleChange(); }
      bool selfNeedsOverflowRecalcAfterStyleChange() const { return m_bitfields.selfNeedsOverflowRecalcAfterStyleChange(); }
      bool childNeedsOverflowRecalcAfterStyleChange() const { return m_bitfields.childNeedsOverflowRecalcAfterStyleChange(); }
  
      bool isSelectionBorder() const;
  
      bool hasClip() const { return isOutOfFlowPositioned() && !style()->hasAutoClip(); }
      bool hasOverflowClip() const { return m_bitfields.hasOverflowClip(); }
      bool hasClipOrOverflowClip() const { return hasClip() || hasOverflowClip(); }
  
      bool hasTransformRelatedProperty() const { return m_bitfields.hasTransformRelatedProperty(); }
      bool hasMask() const { return style() && style()->hasMask(); }
      bool hasClipPath() const { return style() && style()->clipPath(); }
      bool hasHiddenBackface() const { return style() && style()->backfaceVisibility() == BackfaceVisibilityHidden; }
  
      bool hasFilter() const { return style() && style()->hasFilter(); }
  
      bool hasShapeOutside() const { return style() && style()->shapeOutside(); }
  
      inline bool preservesNewline() const;
  
      // The pseudo element style can be cached or uncached.  Use the cached method if the pseudo element doesn't respect
      // any pseudo classes (and therefore has no concept of changing state).
      RenderStyle* getCachedPseudoStyle(PseudoId, RenderStyle* parentStyle = 0) const;
      PassRefPtr<RenderStyle> getUncachedPseudoStyle(const PseudoStyleRequest&, RenderStyle* parentStyle = 0, RenderStyle* ownStyle = 0) const;
  
      virtual void updateDragState(bool dragOn);
  
      RenderView* view() const { return document().renderView(); };
      FrameView* frameView() const { return document().view(); };
  
      bool isRooted() const;
  
      Node* node() const
      {
          return isAnonymous() ? 0 : m_node.get();
      }
  
      Node* nonPseudoNode() const
      {
          return isPseudoElement() ? 0 : node();
      }
  
      // FIXME: Why does RenderPart need this? crbug.com/422457
      void clearNode() { m_node = nullptr; }
  
      // Returns the styled node that caused the generation of this renderer.
      // This is the same as node() except for renderers of :before, :after and
      // :first-letter pseudo elements for which their parent node is returned.
      Node* generatingNode() const { return isPseudoElement() ? node()->parentOrShadowHostNode() : node(); }
  
      Document& document() const { return m_node->document(); }
      LocalFrame* frame() const { return document().frame(); }
  
      virtual RenderMultiColumnSpannerPlaceholder* spannerPlaceholder() const { return 0; }
      bool isColumnSpanAll() const { return style()->columnSpan() == ColumnSpanAll && spannerPlaceholder(); }
  
      // Returns the object containing this one. Can be different from parent for positioned elements.
      // If paintInvalidationContainer and paintInvalidationContainerSkipped are not null, on return *paintInvalidationContainerSkipped
      // is true if the renderer returned is an ancestor of paintInvalidationContainer.
      RenderObject* container(const RenderLayerModelObject* paintInvalidationContainer = 0, bool* paintInvalidationContainerSkipped = 0) const;
      RenderBlock* containerForFixedPosition(const RenderLayerModelObject* paintInvalidationContainer = 0, bool* paintInvalidationContainerSkipped = 0) const;
  
      virtual RenderObject* hoverAncestor() const { return parent(); }
  
      Element* offsetParent() const;
  
      void markContainingBlocksForLayout(bool scheduleRelayout = true, RenderObject* newRoot = 0, SubtreeLayoutScope* = 0);
      void setNeedsLayout(MarkingBehavior = MarkContainingBlockChain, SubtreeLayoutScope* = 0);
      void setNeedsLayoutAndFullPaintInvalidation(MarkingBehavior = MarkContainingBlockChain, SubtreeLayoutScope* = 0);
      void clearNeedsLayout();
      void setChildNeedsLayout(MarkingBehavior = MarkContainingBlockChain, SubtreeLayoutScope* = 0);
      void setNeedsPositionedMovementLayout();
      void setPreferredLogicalWidthsDirty(MarkingBehavior = MarkContainingBlockChain);
      void clearPreferredLogicalWidthsDirty();
      void invalidateContainerPreferredLogicalWidths();
  
      void setNeedsLayoutAndPrefWidthsRecalc()
      {
          setNeedsLayout();
          setPreferredLogicalWidthsDirty();
      }
      void setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation()
      {
          setNeedsLayoutAndFullPaintInvalidation();
          setPreferredLogicalWidthsDirty();
      }
  
      void setPositionState(EPosition position)
      {
          ASSERT((position != AbsolutePosition && position != FixedPosition) || isBox());
          m_bitfields.setPositionedState(position);
      }
      void clearPositionedState() { m_bitfields.clearPositionedState(); }
  
      void setFloating(bool isFloating) { m_bitfields.setFloating(isFloating); }
      void setInline(bool isInline) { m_bitfields.setIsInline(isInline); }
  
      void setHasBoxDecorationBackground(bool);
      void invalidateBackgroundObscurationStatus();
      virtual bool computeBackgroundIsKnownToBeObscured() { return false; }
  
      void setIsText() { m_bitfields.setIsText(true); }
      void setIsBox() { m_bitfields.setIsBox(true); }
      void setReplaced(bool isReplaced) { m_bitfields.setIsReplaced(isReplaced); }
      void setHorizontalWritingMode(bool hasHorizontalWritingMode) { m_bitfields.setHorizontalWritingMode(hasHorizontalWritingMode); }
      void setHasOverflowClip(bool hasOverflowClip) { m_bitfields.setHasOverflowClip(hasOverflowClip); }
      void setHasLayer(bool hasLayer) { m_bitfields.setHasLayer(hasLayer); }
      void setHasTransformRelatedProperty(bool hasTransform) { m_bitfields.setHasTransformRelatedProperty(hasTransform); }
      void setHasReflection(bool hasReflection) { m_bitfields.setHasReflection(hasReflection); }
  
      void scheduleRelayout();
  
      void updateFillImages(const FillLayer* oldLayers, const FillLayer& newLayers);
      void updateImage(StyleImage*, StyleImage*);
      void updateShapeImage(const ShapeValue*, const ShapeValue*);
  
      // paintOffset is the offset from the origin of the GraphicsContext at which to paint the current object.
      virtual void paint(const PaintInfo&, const LayoutPoint& paintOffset);
  
      // Subclasses must reimplement this method to compute the size and position
      // of this object and all its descendants.
      virtual void layout() = 0;
      virtual bool updateImageLoadingPriorities() { return false; }
      void setHasPendingResourceUpdate(bool hasPendingResourceUpdate) { m_bitfields.setHasPendingResourceUpdate(hasPendingResourceUpdate); }
      bool hasPendingResourceUpdate() const { return m_bitfields.hasPendingResourceUpdate(); }
  
      /* This function performs a layout only if one is needed. */
      void layoutIfNeeded() { if (needsLayout()) layout(); }
  
      void forceLayout();
      void forceChildLayout();
  
      // Used for element state updates that cannot be fixed with a
      // paint invalidation and do not need a relayout.
      virtual void updateFromElement() { }
  
      virtual void addAnnotatedRegions(Vector<AnnotatedRegionValue>&);
      void collectAnnotatedRegions(Vector<AnnotatedRegionValue>&);
  
      CompositingState compositingState() const;
      virtual CompositingReasons additionalCompositingReasons() const;
  
      bool hitTest(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestFilter = HitTestAll);
      virtual void updateHitTestResult(HitTestResult&, const LayoutPoint&);
      virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction);
  
      virtual PositionWithAffinity positionForPoint(const LayoutPoint&);
      PositionWithAffinity createPositionWithAffinity(int offset, EAffinity);
      PositionWithAffinity createPositionWithAffinity(const Position&);
  
      virtual void dirtyLinesFromChangedChild(RenderObject*);
  
      // Set the style of the object and update the state of the object accordingly.
      void setStyle(PassRefPtr<RenderStyle>);
  
      // Set the style of the object if it's generated content.
      void setPseudoStyle(PassRefPtr<RenderStyle>);
  
      // Updates only the local style ptr of the object.  Does not update the state of the object,
      // and so only should be called when the style is known not to have changed (or from setStyle).
      void setStyleInternal(PassRefPtr<RenderStyle> style) { m_style = style; }
  
      // returns the containing block level element for this element.
      RenderBlock* containingBlock() const;
  
      bool canContainFixedPositionObjects() const
      {
          return isRenderView() || (hasTransformRelatedProperty() && isRenderBlock()) || isSVGForeignObject();
      }
  
      // Convert the given local point to absolute coordinates
      // FIXME: Temporary. If UseTransforms is true, take transforms into account. Eventually localToAbsolute() will always be transform-aware.
      FloatPoint localToAbsolute(const FloatPoint& localPoint = FloatPoint(), MapCoordinatesFlags = 0) const;
      FloatPoint absoluteToLocal(const FloatPoint&, MapCoordinatesFlags = 0) const;
  
      // Convert a local quad to absolute coordinates, taking transforms into account.
      FloatQuad localToAbsoluteQuad(const FloatQuad& quad, MapCoordinatesFlags mode = 0, bool* wasFixed = 0) const
      {
          return localToContainerQuad(quad, 0, mode, wasFixed);
      }
      // Convert an absolute quad to local coordinates.
      FloatQuad absoluteToLocalQuad(const FloatQuad&, MapCoordinatesFlags mode = 0) const;
  
      // Convert a local quad into the coordinate system of container, taking transforms into account.
      FloatQuad localToContainerQuad(const FloatQuad&, const RenderLayerModelObject* paintInvalidatinoContainer, MapCoordinatesFlags = 0, bool* wasFixed = 0) const;
      FloatPoint localToContainerPoint(const FloatPoint&, const RenderLayerModelObject* paintInvalidationContainer, MapCoordinatesFlags = 0, bool* wasFixed = 0, const PaintInvalidationState* = 0) const;
  
      // Convert a local point into the coordinate system of backing coordinates. Also returns the backing layer if needed.
      FloatPoint localToInvalidationBackingPoint(const LayoutPoint&, RenderLayer** backingLayer = nullptr);
  
      // Return the offset from the container() renderer (excluding transforms). In multi-column layout,
      // different offsets apply at different points, so return the offset that applies to the given point.
      virtual LayoutSize offsetFromContainer(const RenderObject*, const LayoutPoint&, bool* offsetDependsOnPoint = 0) const;
      // Return the offset from an object up the container() chain. Asserts that none of the intermediate objects have transforms.
      LayoutSize offsetFromAncestorContainer(const RenderObject*) const;
  
      virtual void absoluteRects(Vector<IntRect>&, const LayoutPoint&) const { }
  
      IntRect absoluteBoundingBoxRect() const;
      // FIXME: This function should go away eventually
      IntRect absoluteBoundingBoxRectIgnoringTransforms() const;
  
      // Build an array of quads in absolute coords for line boxes
      virtual void absoluteQuads(Vector<FloatQuad>&, bool* /*wasFixed*/ = 0) const { }
  
      virtual IntRect absoluteFocusRingBoundingBoxRect() const;
  
      static FloatRect absoluteBoundingBoxRectForRange(const Range*);
  
      // the rect that will be painted if this object is passed as the paintingRoot
      LayoutRect paintingRootRect(LayoutRect& topLevelRect);
  
      virtual LayoutUnit minPreferredLogicalWidth() const { return 0; }
      virtual LayoutUnit maxPreferredLogicalWidth() const { return 0; }
  
      RenderStyle* style() const { return m_style.get(); }
  
      /* The two following methods are inlined in RenderObjectInlines.h */
      RenderStyle* firstLineStyle() const;
      RenderStyle* style(bool firstLine) const;
  
      static inline Color resolveColor(const RenderStyle* styleToUse, int colorProperty)
      {
          return styleToUse->visitedDependentColor(colorProperty);
      }
  
      inline Color resolveColor(int colorProperty) const
      {
          return style()->visitedDependentColor(colorProperty);
      }
  
      // Used only by Element::pseudoStyleCacheIsInvalid to get a first line style based off of a
      // given new style, without accessing the cache.
      PassRefPtr<RenderStyle> uncachedFirstLineStyle(RenderStyle*) const;
  
      virtual CursorDirective getCursor(const LayoutPoint&, Cursor&) const;
  
      struct AppliedTextDecoration {
          Color color;
          TextDecorationStyle style;
          AppliedTextDecoration() : color(Color::transparent), style(TextDecorationStyleSolid) { }
      };
  
      void getTextDecorations(unsigned decorations, AppliedTextDecoration& underline, AppliedTextDecoration& overline, AppliedTextDecoration& linethrough, bool quirksMode = false, bool firstlineStyle = false);
  
      // Return the RenderLayerModelObject in the container chain which is responsible for painting this object, or 0
      // if painting is root-relative. This is the container that should be passed to the 'forPaintInvalidation'
      // methods.
      const RenderLayerModelObject* containerForPaintInvalidation() const;
      const RenderLayerModelObject* adjustCompositedContainerForSpecialAncestors(const RenderLayerModelObject* paintInvalidationContainer) const;
      bool isPaintInvalidationContainer() const;
  
      LayoutRect computePaintInvalidationRect()
      {
          return computePaintInvalidationRect(containerForPaintInvalidation());
      }
  
      // Returns the paint invalidation rect for this RenderObject in the coordinate space of the paint backing (typically a GraphicsLayer) for |paintInvalidationContainer|.
      LayoutRect computePaintInvalidationRect(const RenderLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* = 0) const;
  
      // Returns the rect bounds needed to invalidate the paint of this object, in the coordinate space of the rendering backing of |paintInvalidationContainer|
      LayoutRect boundsRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* = 0) const;
  
      // Actually do the paint invalidate of rect r for this object which has been computed in the coordinate space
      // of the GraphicsLayer backing of |paintInvalidationContainer|. Note that this coordinaten space is not the same
      // as the local coordinate space of |paintInvalidationContainer| in the presence of layer squashing.
      // If |paintInvalidationContainer| is 0, invalidate paints via the view.
      // FIXME: |paintInvalidationContainer| should never be 0. See crbug.com/363699.
      void invalidatePaintUsingContainer(const RenderLayerModelObject* paintInvalidationContainer, const LayoutRect&, PaintInvalidationReason) const;
  
      // Invalidate the paint of a specific subrectangle within a given object. The rect |r| is in the object's coordinate space.
      void invalidatePaintRectangle(const LayoutRect&) const;
  
      void invalidateSelectionIfNeeded(const RenderLayerModelObject&, PaintInvalidationReason);
  
      // Walk the tree after layout issuing paint invalidations for renderers that have changed or moved, updating bounds that have changed, and clearing paint invalidation state.
      virtual void invalidateTreeIfNeeded(const PaintInvalidationState&);
  
      virtual void invalidatePaintForOverflow();
      void invalidatePaintForOverflowIfNeeded();
  
      void invalidatePaintIncludingNonCompositingDescendants();
  
      // Returns the rect that should have paint invalidated whenever this object changes. The rect is in the view's
      // coordinate space. This method deals with outlines and overflow.
      virtual LayoutRect absoluteClippedOverflowRect() const;
      virtual LayoutRect clippedOverflowRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* = 0) const;
      virtual LayoutRect rectWithOutlineForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, LayoutUnit outlineWidth, const PaintInvalidationState* = 0) const;
  
      // Given a rect in the object's coordinate space, compute a rect suitable for invalidating paints of
      // that rect in the coordinate space of paintInvalidationContainer.
      virtual void mapRectToPaintInvalidationBacking(const RenderLayerModelObject* paintInvalidationContainer, LayoutRect&, const PaintInvalidationState*) const;
  
      // Return the offset to the column in which the specified point (in flow-thread coordinates)
      // lives. This is used to convert a flow-thread point to a visual point.
      virtual LayoutSize columnOffset(const LayoutPoint&) const { return LayoutSize(); }
  
      virtual unsigned length() const { return 1; }
  
      bool isFloatingOrOutOfFlowPositioned() const { return (isFloating() || isOutOfFlowPositioned()); }
  
      bool isTransparent() const { return style()->hasOpacity(); }
      float opacity() const { return style()->opacity(); }
  
      bool hasReflection() const { return m_bitfields.hasReflection(); }
  
      enum SelectionState {
          SelectionNone, // The object is not selected.
          SelectionStart, // The object either contains the start of a selection run or is the start of a run
          SelectionInside, // The object is fully encompassed by a selection run
          SelectionEnd, // The object either contains the end of a selection run or is the end of a run
          SelectionBoth // The object contains an entire run or is the sole selected object in that run
      };
  
      // The current selection state for an object.  For blocks, the state refers to the state of the leaf
      // descendants (as described above in the SelectionState enum declaration).
      SelectionState selectionState() const { return m_bitfields.selectionState(); }
      virtual void setSelectionState(SelectionState state) { m_bitfields.setSelectionState(state); }
      inline void setSelectionStateIfNeeded(SelectionState);
      bool canUpdateSelectionOnRootLineBoxes() const;
  
      // A single rectangle that encompasses all of the selected objects within this object.  Used to determine the tightest
      // possible bounding box for the selection. The rect returned is in the coordinate space of the paint invalidation container's backing.
      virtual LayoutRect selectionRectForPaintInvalidation(const RenderLayerModelObject* /*paintInvalidationContainer*/) const { return LayoutRect(); }
  
      virtual bool canBeSelectionLeaf() const { return false; }
      bool hasSelectedChildren() const { return selectionState() != SelectionNone; }
  
      bool isSelectable() const;
      // Obtains the selection colors that should be used when painting a selection.
      Color selectionBackgroundColor() const;
      Color selectionForegroundColor() const;
      Color selectionEmphasisMarkColor() const;
  
      // Whether or not a given block needs to paint selection gaps.
      virtual bool shouldPaintSelectionGaps() const { return false; }
  
      /**
       * Returns the local coordinates of the caret within this render object.
       * @param caretOffset zero-based offset determining position within the render object.
       * @param extraWidthToEndOfLine optional out arg to give extra width to end of line -
       * useful for character range rect computations
       */
      virtual LayoutRect localCaretRect(InlineBox*, int caretOffset, LayoutUnit* extraWidthToEndOfLine = 0);
  
      // When performing a global document tear-down, the renderer of the document is cleared. We use this
      // as a hook to detect the case of document destruction and don't waste time doing unnecessary work.
      bool documentBeingDestroyed() const;
  
      void destroyAndCleanupAnonymousWrappers();
      virtual void destroy();
  
      // Virtual function helpers for the deprecated Flexible Box Layout (display: -webkit-box).
      virtual bool isDeprecatedFlexibleBox() const { return false; }
  
      // Virtual function helper for the new FlexibleBox Layout (display: -webkit-flex).
      virtual bool isFlexibleBox() const { return false; }
  
      bool isFlexibleBoxIncludingDeprecated() const
      {
          return isFlexibleBox() || isDeprecatedFlexibleBox();
      }
  
      virtual bool isCombineText() const { return false; }
  
      virtual int caretMinOffset() const;
      virtual int caretMaxOffset() const;
  
      virtual int previousOffset(int current) const;
      virtual int previousOffsetForBackwardDeletion(int current) const;
      virtual int nextOffset(int current) const;
  
      virtual void imageChanged(ImageResource*, const IntRect* = 0) override final;
      virtual void imageChanged(WrappedImagePtr, const IntRect* = 0) { }
      virtual bool willRenderImage(ImageResource*) override final;
      virtual bool getImageAnimationPolicy(ImageResource*, ImageAnimationPolicy&) override final;
  
      void selectionStartEnd(int& spos, int& epos) const;
  
      void remove() { if (parent()) parent()->removeChild(this); }
  
      bool isInert() const;
  
      bool supportsTouchAction() const;
  
      bool visibleToHitTestRequest(const HitTestRequest& request) const { return style()->visibility() == VISIBLE && (request.ignorePointerEventsNone() || style()->pointerEvents() != PE_NONE) && !isInert(); }
  
      bool visibleToHitTesting() const { return style()->visibility() == VISIBLE && style()->pointerEvents() != PE_NONE && !isInert(); }
  
      // Map points and quads through elements, potentially via 3d transforms. You should never need to call these directly; use
      // localToAbsolute/absoluteToLocal methods instead.
      virtual void mapLocalToContainer(const RenderLayerModelObject* paintInvalidationContainer, TransformState&, MapCoordinatesFlags = ApplyContainerFlip, bool* wasFixed = 0, const PaintInvalidationState* = 0) const;
      virtual void mapAbsoluteToLocalPoint(MapCoordinatesFlags, TransformState&) const;
  
      // Pushes state onto RenderGeometryMap about how to map coordinates from this renderer to its container, or ancestorToStopAt (whichever is encountered first).
      // Returns the renderer which was mapped to (container or ancestorToStopAt).
      virtual const RenderObject* pushMappingToContainer(const RenderLayerModelObject* ancestorToStopAt, RenderGeometryMap&) const;
  
      bool shouldUseTransformFromContainer(const RenderObject* container) const;
      void getTransformFromContainer(const RenderObject* container, const LayoutSize& offsetInContainer, TransformationMatrix&) const;
  
      bool createsGroup() const { return isTransparent() || hasMask() || hasFilter() || style()->hasBlendMode(); }
  
      virtual void addFocusRingRects(Vector<LayoutRect>&, const LayoutPoint& additionalOffset) const { }
  
      // Compute a list of hit-test rectangles per layer rooted at this renderer.
      virtual void computeLayerHitTestRects(LayerHitTestRects&) const;
  
      // Return the renderer whose background style is used to paint the root background. Should only be called on the renderer for which isDocumentElement() is true.
      RenderObject* rendererForRootBackground();
  
      RespectImageOrientationEnum shouldRespectImageOrientation() const;
  
      bool isRelayoutBoundaryForInspector() const;
  
      // The previous paint invalidation rect in the object's previous paint backing.
      const LayoutRect& previousPaintInvalidationRect() const { return m_previousPaintInvalidationRect; }
      void setPreviousPaintInvalidationRect(const LayoutRect& rect) { m_previousPaintInvalidationRect = rect; }
  
      // The previous position of the top-left corner of the object in its previous paint backing.
      const LayoutPoint& previousPositionFromPaintInvalidationBacking() const { return m_previousPositionFromPaintInvalidationBacking; }
      void setPreviousPositionFromPaintInvalidationBacking(const LayoutPoint& positionFromPaintInvalidationBacking) { m_previousPositionFromPaintInvalidationBacking = positionFromPaintInvalidationBacking; }
  
      bool shouldDoFullPaintInvalidation() const { return m_bitfields.fullPaintInvalidationReason() != PaintInvalidationNone; }
      void setShouldDoFullPaintInvalidation(PaintInvalidationReason = PaintInvalidationFull);
      void clearShouldDoFullPaintInvalidation() { m_bitfields.setFullPaintInvalidationReason(PaintInvalidationNone); }
  
      bool shouldInvalidateOverflowForPaint() const { return m_bitfields.shouldInvalidateOverflowForPaint(); }
  
      virtual void clearPaintInvalidationState(const PaintInvalidationState&);
  
      // Indicates whether this render object was re-laid-out since the last frame.
      // The flag will be cleared during invalidateTreeIfNeeded.
      bool layoutDidGetCalledSinceLastFrame() const { return m_bitfields.layoutDidGetCalledSinceLastFrame(); }
  
      bool mayNeedPaintInvalidation() const { return m_bitfields.mayNeedPaintInvalidation(); }
      void setMayNeedPaintInvalidation(bool b)
      {
          m_bitfields.setMayNeedPaintInvalidation(b);
  
          // Make sure our parent is marked as needing invalidation.
          if (b)
              markContainingBlockChainForPaintInvalidation();
      }
  
      bool shouldInvalidateSelection() const { return m_bitfields.shouldInvalidateSelection(); }
      void setShouldInvalidateSelection()
      {
          if (!canUpdateSelectionOnRootLineBoxes())
              return;
  
          m_bitfields.setShouldInvalidateSelection(true);
          markContainingBlockChainForPaintInvalidation();
      }
      void clearShouldInvalidateSelection() { m_bitfields.setShouldInvalidateSelection(false); }
  
      bool neededLayoutBecauseOfChildren() const { return m_bitfields.neededLayoutBecauseOfChildren(); }
      void setNeededLayoutBecauseOfChildren(bool b) { m_bitfields.setNeededLayoutBecauseOfChildren(b); }
  
      bool shouldCheckForPaintInvalidation(const PaintInvalidationState& paintInvalidationState) const
      {
          return paintInvalidationState.forceCheckForPaintInvalidation() || shouldCheckForPaintInvalidationRegardlessOfPaintInvalidationState();
      }
  
      bool shouldCheckForPaintInvalidationRegardlessOfPaintInvalidationState() const
      {
          return layoutDidGetCalledSinceLastFrame() || mayNeedPaintInvalidation() || shouldDoFullPaintInvalidation() || shouldInvalidateSelection();
      }
  
      virtual bool supportsPaintInvalidationStateCachedOffsets() const { return !hasColumns() && !hasTransformRelatedProperty() && !hasReflection() && !style()->isFlippedBlocksWritingMode(); }
  
      void setNeedsOverflowRecalcAfterStyleChange();
      void markContainingBlocksForOverflowRecalc();
  
      virtual LayoutRect viewRect() const;
  
      DisplayItemClient displayItemClient() const { return static_cast<DisplayItemClientInternalVoid*>((void*)this); }
  
  protected:
      enum RenderObjectType {
          RenderObjectBr,
          RenderObjectCanvas,
          RenderObjectFieldset,
          RenderObjectCounter,
          RenderObjectDetailsMarker,
          RenderObjectEmbeddedObject,
          RenderObjectFileUploadControl,
          RenderObjectFrame,
          RenderObjectFrameSet,
          RenderObjectLayoutTableCol,
          RenderObjectListBox,
          RenderObjectListItem,
          RenderObjectListMarker,
          RenderObjectMedia,
          RenderObjectMenuList,
          RenderObjectMeter,
          RenderObjectProgress,
          RenderObjectQuote,
          RenderObjectRenderButton,
          RenderObjectRenderFlowThread,
          RenderObjectRenderFullScreen,
          RenderObjectRenderFullScreenPlaceholder,
          RenderObjectRenderGrid,
          RenderObjectRenderIFrame,
          RenderObjectRenderImage,
          RenderObjectRenderInline,
          RenderObjectRenderMultiColumnSet,
          RenderObjectRenderMultiColumnSpannerPlaceholder,
          RenderObjectRenderPart,
          RenderObjectRenderRegion,
          RenderObjectRenderScrollbarPart,
          RenderObjectRenderView,
          RenderObjectReplica,
          RenderObjectRuby,
          RenderObjectRubyBase,
          RenderObjectRubyRun,
          RenderObjectRubyText,
          RenderObjectSlider,
          RenderObjectSliderThumb,
          RenderObjectTable,
          RenderObjectTableCaption,
          RenderObjectTableCell,
          RenderObjectTableRow,
          RenderObjectTableSection,
          RenderObjectTextArea,
          RenderObjectTextControl,
          RenderObjectTextField,
          RenderObjectVideo,
          RenderObjectWidget,
  
          RenderObjectSVG, /* Keep by itself? */
          RenderObjectSVGRoot,
          RenderObjectSVGContainer,
          RenderObjectSVGTransformableContainer,
          RenderObjectSVGViewportContainer,
          RenderObjectSVGHiddenContainer,
          RenderObjectSVGGradientStop,
          RenderObjectSVGShape,
          RenderObjectSVGText,
          RenderObjectSVGTextPath,
          RenderObjectSVGInline,
          RenderObjectSVGInlineText,
          RenderObjectSVGImage,
          RenderObjectSVGForeignObject,
          RenderObjectSVGResourceContainer,
          RenderObjectSVGResourceFilter,
          RenderObjectSVGResourceFilterPrimitive,
      };
      virtual bool isOfType(RenderObjectType type) const { return false; }
  
      inline bool layerCreationAllowedForSubtree() const;
  
      // Overrides should call the superclass at the end. m_style will be 0 the first time
      // this function will be called.
      virtual void styleWillChange(StyleDifference, const RenderStyle& newStyle);
      // Overrides should call the superclass at the start. |oldStyle| will be 0 the first
      // time this function is called.
      virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
      void propagateStyleToAnonymousChildren(bool blockChildrenOnly = false);
      virtual void updateAnonymousChildStyle(const RenderObject* child, RenderStyle* style) const { }
  
  protected:
      void clearLayoutRootIfNeeded() const;
      virtual void willBeDestroyed();
      void postDestroy();
  
      virtual void insertedIntoTree();
      virtual void willBeRemovedFromTree();
  
      void setDocumentForAnonymous(Document* document) { ASSERT(isAnonymous()); m_node = document; }
  
      // Add hit-test rects for the render tree rooted at this node to the provided collection on a
      // per-RenderLayer basis.
      // currentLayer must be the enclosing layer, and layerOffset is the current offset within
      // this layer. Subclass implementations will add any offset for this renderer within it's
      // container, so callers should provide only the offset of the container within it's layer.
      // containerRect is a rect that has already been added for the currentLayer which is likely to
      // be a container for child elements. Any rect wholly contained by containerRect can be
      // skipped.
      virtual void addLayerHitTestRects(LayerHitTestRects&, const RenderLayer* currentLayer, const LayoutPoint& layerOffset, const LayoutRect& containerRect) const;
  
      // Add hit-test rects for this renderer only to the provided list. layerOffset is the offset
      // of this renderer within the current layer that should be used for each result.
      virtual void computeSelfHitTestRects(Vector<LayoutRect>&, const LayoutPoint& layerOffset) const { };
  
      virtual PaintInvalidationReason paintInvalidationReason(const RenderLayerModelObject& paintInvalidationContainer,
          const LayoutRect& oldPaintInvalidationRect, const LayoutPoint& oldPositionFromPaintInvalidationBacking,
          const LayoutRect& newPaintInvalidationRect, const LayoutPoint& newPositionFromPaintInvalidationBacking) const;
      virtual void incrementallyInvalidatePaint(const RenderLayerModelObject& paintInvalidationContainer, const LayoutRect& oldBounds, const LayoutRect& newBounds, const LayoutPoint& positionFromPaintInvalidationBacking);
      void fullyInvalidatePaint(const RenderLayerModelObject& paintInvalidationContainer, PaintInvalidationReason, const LayoutRect& oldBounds, const LayoutRect& newBounds);
  
  #if ENABLE(ASSERT)
      virtual bool paintInvalidationStateIsDirty() const
      {
          return neededLayoutBecauseOfChildren() || shouldCheckForPaintInvalidationRegardlessOfPaintInvalidationState();
      }
  #endif
  
      virtual void invalidatePaintOfSubtreesIfNeeded(const PaintInvalidationState& childPaintInvalidationState);
      virtual PaintInvalidationReason invalidatePaintIfNeeded(const PaintInvalidationState&, const RenderLayerModelObject& paintInvalidationContainer);
  
  private:
      void setLayoutDidGetCalledSinceLastFrame()
      {
          m_bitfields.setLayoutDidGetCalledSinceLastFrame(true);
  
          // Make sure our parent is marked as needing invalidation.
          // This would be unneeded if we allowed sub-tree invalidation (akin to sub-tree layouts).
          markContainingBlockChainForPaintInvalidation();
      }
      void clearLayoutDidGetCalledSinceLastFrame() { m_bitfields.setLayoutDidGetCalledSinceLastFrame(false); }
  
      void invalidatePaintIncludingNonCompositingDescendantsInternal(const RenderLayerModelObject* repaintContainer);
  
      LayoutRect previousSelectionRectForPaintInvalidation() const;
      void setPreviousSelectionRectForPaintInvalidation(const LayoutRect&);
  
      const RenderLayerModelObject* enclosingCompositedContainer() const;
  
      RenderFlowThread* locateFlowThreadContainingBlock() const;
      void removeFromRenderFlowThread();
      void removeFromRenderFlowThreadRecursive(RenderFlowThread*);
  
      RenderStyle* cachedFirstLineStyle() const;
      StyleDifference adjustStyleDifference(StyleDifference) const;
  
      Color selectionColor(int colorProperty) const;
  
      void removeShapeImageClient(ShapeValue*);
  
  #if ENABLE(ASSERT)
      void checkBlockPositionedObjectsNeedLayout();
  #endif
  
      void markContainingBlockChainForPaintInvalidation()
      {
          for (RenderObject* container = this->container(); container && !container->shouldCheckForPaintInvalidationRegardlessOfPaintInvalidationState(); container = container->container())
              container->setMayNeedPaintInvalidation(true);
      }
  
      static bool isAllowedToModifyRenderTreeStructure(Document&);
  
      RefPtr<RenderStyle> m_style;
  
      RawPtrWillBeMember<Node> m_node;
  
      RawPtrWillBeMember<RenderObject> m_parent;
      RawPtrWillBeMember<RenderObject> m_previous;
      RawPtrWillBeMember<RenderObject> m_next;
  
  #if ENABLE(ASSERT)
      unsigned m_hasAXObject             : 1;
      unsigned m_setNeedsLayoutForbidden : 1;
  #if ENABLE(OILPAN)
  protected:
      unsigned m_didCallDestroy          : 1;
  private:
  #endif
  #endif
  
  #define ADD_BOOLEAN_BITFIELD(name, Name) \
      private:\
          unsigned m_##name : 1;\
      public:\
          bool name() const { return m_##name; }\
          void set##Name(bool name) { m_##name = name; }\
  
      class RenderObjectBitfields {
          enum PositionedState {
              IsStaticallyPositioned = 0,
              IsRelativelyPositioned = 1,
              IsOutOfFlowPositioned = 2,
          };
  
      public:
          RenderObjectBitfields(Node* node)
              : m_selfNeedsLayout(false)
              , m_shouldInvalidateOverflowForPaint(false)
              // FIXME: We should remove mayNeedPaintInvalidation once we are able to
              // use the other layout flags to detect the same cases. crbug.com/370118
              , m_mayNeedPaintInvalidation(false)
              , m_shouldInvalidateSelection(false)
              , m_neededLayoutBecauseOfChildren(false)
              , m_needsPositionedMovementLayout(false)
              , m_normalChildNeedsLayout(false)
              , m_posChildNeedsLayout(false)
              , m_needsSimplifiedNormalFlowLayout(false)
              , m_preferredLogicalWidthsDirty(false)
              , m_floating(false)
              , m_selfNeedsOverflowRecalcAfterStyleChange(false)
              , m_childNeedsOverflowRecalcAfterStyleChange(false)
              , m_isAnonymous(!node)
              , m_isText(false)
              , m_isBox(false)
              , m_isInline(true)
              , m_isReplaced(false)
              , m_horizontalWritingMode(true)
              , m_isDragging(false)
              , m_hasLayer(false)
              , m_hasOverflowClip(false)
              , m_hasTransformRelatedProperty(false)
              , m_hasReflection(false)
              , m_hasCounterNodeMap(false)
              , m_everHadLayout(false)
              , m_ancestorLineBoxDirty(false)
              , m_layoutDidGetCalledSinceLastFrame(false)
              , m_hasPendingResourceUpdate(false)
              , m_childrenInline(false)
              , m_hasColumns(false)
              , m_alwaysCreateLineBoxesForRenderInline(false)
              , m_positionedState(IsStaticallyPositioned)
              , m_selectionState(SelectionNone)
              , m_flowThreadState(NotInsideFlowThread)
              , m_boxDecorationBackgroundState(NoBoxDecorationBackground)
              , m_fullPaintInvalidationReason(PaintInvalidationNone)
          {
          }
  
          // 32 bits have been used in the first word, and 14 in the second.
          ADD_BOOLEAN_BITFIELD(selfNeedsLayout, SelfNeedsLayout);
          ADD_BOOLEAN_BITFIELD(shouldInvalidateOverflowForPaint, ShouldInvalidateOverflowForPaint);
          ADD_BOOLEAN_BITFIELD(mayNeedPaintInvalidation, MayNeedPaintInvalidation);
          ADD_BOOLEAN_BITFIELD(shouldInvalidateSelection, ShouldInvalidateSelection);
          ADD_BOOLEAN_BITFIELD(neededLayoutBecauseOfChildren, NeededLayoutBecauseOfChildren);
          ADD_BOOLEAN_BITFIELD(needsPositionedMovementLayout, NeedsPositionedMovementLayout);
          ADD_BOOLEAN_BITFIELD(normalChildNeedsLayout, NormalChildNeedsLayout);
          ADD_BOOLEAN_BITFIELD(posChildNeedsLayout, PosChildNeedsLayout);
          ADD_BOOLEAN_BITFIELD(needsSimplifiedNormalFlowLayout, NeedsSimplifiedNormalFlowLayout);
          ADD_BOOLEAN_BITFIELD(preferredLogicalWidthsDirty, PreferredLogicalWidthsDirty);
          ADD_BOOLEAN_BITFIELD(floating, Floating);
          ADD_BOOLEAN_BITFIELD(selfNeedsOverflowRecalcAfterStyleChange, SelfNeedsOverflowRecalcAfterStyleChange);
          ADD_BOOLEAN_BITFIELD(childNeedsOverflowRecalcAfterStyleChange, ChildNeedsOverflowRecalcAfterStyleChange);
  
          ADD_BOOLEAN_BITFIELD(isAnonymous, IsAnonymous);
          ADD_BOOLEAN_BITFIELD(isText, IsText);
          ADD_BOOLEAN_BITFIELD(isBox, IsBox);
          ADD_BOOLEAN_BITFIELD(isInline, IsInline);
          ADD_BOOLEAN_BITFIELD(isReplaced, IsReplaced);
          ADD_BOOLEAN_BITFIELD(horizontalWritingMode, HorizontalWritingMode);
          ADD_BOOLEAN_BITFIELD(isDragging, IsDragging);
  
          ADD_BOOLEAN_BITFIELD(hasLayer, HasLayer);
          ADD_BOOLEAN_BITFIELD(hasOverflowClip, HasOverflowClip); // Set in the case of overflow:auto/scroll/hidden
          ADD_BOOLEAN_BITFIELD(hasTransformRelatedProperty, HasTransformRelatedProperty);
          ADD_BOOLEAN_BITFIELD(hasReflection, HasReflection);
  
          ADD_BOOLEAN_BITFIELD(hasCounterNodeMap, HasCounterNodeMap);
          ADD_BOOLEAN_BITFIELD(everHadLayout, EverHadLayout);
          ADD_BOOLEAN_BITFIELD(ancestorLineBoxDirty, AncestorLineBoxDirty);
  
          ADD_BOOLEAN_BITFIELD(layoutDidGetCalledSinceLastFrame, LayoutDidGetCalledSinceLastFrame);
  
          ADD_BOOLEAN_BITFIELD(hasPendingResourceUpdate, HasPendingResourceUpdate);
  
          // from RenderBlock
          ADD_BOOLEAN_BITFIELD(childrenInline, ChildrenInline);
          ADD_BOOLEAN_BITFIELD(hasColumns, HasColumns);
  
          // from RenderInline
          ADD_BOOLEAN_BITFIELD(alwaysCreateLineBoxesForRenderInline, AlwaysCreateLineBoxesForRenderInline);
  
      private:
          unsigned m_positionedState : 2; // PositionedState
          unsigned m_selectionState : 3; // SelectionState
          unsigned m_flowThreadState : 2; // FlowThreadState
          unsigned m_boxDecorationBackgroundState : 2; // BoxDecorationBackgroundState
          unsigned m_fullPaintInvalidationReason : 5; // PaintInvalidationReason
  
      public:
          bool isOutOfFlowPositioned() const { return m_positionedState == IsOutOfFlowPositioned; }
          bool isRelPositioned() const { return m_positionedState == IsRelativelyPositioned; }
          bool isPositioned() const { return m_positionedState != IsStaticallyPositioned; }
  
          void setPositionedState(int positionState)
          {
              // This mask maps FixedPosition and AbsolutePosition to IsOutOfFlowPositioned, saving one bit.
              m_positionedState = static_cast<PositionedState>(positionState & 0x3);
          }
          void clearPositionedState() { m_positionedState = StaticPosition; }
  
          ALWAYS_INLINE SelectionState selectionState() const { return static_cast<SelectionState>(m_selectionState); }
          ALWAYS_INLINE void setSelectionState(SelectionState selectionState) { m_selectionState = selectionState; }
  
          ALWAYS_INLINE FlowThreadState flowThreadState() const { return static_cast<FlowThreadState>(m_flowThreadState); }
          ALWAYS_INLINE void setFlowThreadState(FlowThreadState flowThreadState) { m_flowThreadState = flowThreadState; }
  
          ALWAYS_INLINE BoxDecorationBackgroundState boxDecorationBackgroundState() const { return static_cast<BoxDecorationBackgroundState>(m_boxDecorationBackgroundState); }
          ALWAYS_INLINE void setBoxDecorationBackgroundState(BoxDecorationBackgroundState s) { m_boxDecorationBackgroundState = s; }
  
          PaintInvalidationReason fullPaintInvalidationReason() const { return static_cast<PaintInvalidationReason>(m_fullPaintInvalidationReason); }
          void setFullPaintInvalidationReason(PaintInvalidationReason reason) { m_fullPaintInvalidationReason = reason; }
      };
  
  #undef ADD_BOOLEAN_BITFIELD
  
      RenderObjectBitfields m_bitfields;
  
      void setSelfNeedsLayout(bool b) { m_bitfields.setSelfNeedsLayout(b); }
      void setNeedsPositionedMovementLayout(bool b) { m_bitfields.setNeedsPositionedMovementLayout(b); }
      void setNormalChildNeedsLayout(bool b) { m_bitfields.setNormalChildNeedsLayout(b); }
      void setPosChildNeedsLayout(bool b) { m_bitfields.setPosChildNeedsLayout(b); }
      void setNeedsSimplifiedNormalFlowLayout(bool b) { m_bitfields.setNeedsSimplifiedNormalFlowLayout(b); }
      void setIsDragging(bool b) { m_bitfields.setIsDragging(b); }
      void setEverHadLayout(bool b) { m_bitfields.setEverHadLayout(b); }
      void setShouldInvalidateOverflowForPaint(bool b) { m_bitfields.setShouldInvalidateOverflowForPaint(b); }
      void setSelfNeedsOverflowRecalcAfterStyleChange(bool b) { m_bitfields.setSelfNeedsOverflowRecalcAfterStyleChange(b); }
      void setChildNeedsOverflowRecalcAfterStyleChange(bool b) { m_bitfields.setChildNeedsOverflowRecalcAfterStyleChange(b); }
  
  private:
      // Store state between styleWillChange and styleDidChange
      static bool s_affectsParentBlock;
  
      // This stores the paint invalidation rect from the previous frame.
      LayoutRect m_previousPaintInvalidationRect;
  
      // This stores the position in the paint invalidation backing's coordinate.
      // It is used to detect renderer shifts that forces a full invalidation.
      LayoutPoint m_previousPositionFromPaintInvalidationBacking;
  
      static unsigned s_instanceCount;
  };
  
  WILL_NOT_BE_EAGERLY_TRACED_CLASS(RenderObject);
  
  // FIXME: remove this once the render object lifecycle ASSERTS are no longer hit.
  class DeprecatedDisableModifyRenderTreeStructureAsserts {
      WTF_MAKE_NONCOPYABLE(DeprecatedDisableModifyRenderTreeStructureAsserts);
  public:
      DeprecatedDisableModifyRenderTreeStructureAsserts();
  
      static bool canModifyRenderTreeStateInAnyState();
  
  private:
      TemporaryChange<bool> m_disabler;
  };
  
  // Allow equality comparisons of RenderObjects by reference or pointer, interchangeably.
  DEFINE_COMPARISON_OPERATORS_WITH_REFERENCES(RenderObject)
  
  inline bool RenderObject::documentBeingDestroyed() const
  {
      return document().lifecycle().state() >= DocumentLifecycle::Stopping;
  }
  
  inline bool RenderObject::isBeforeContent() const
  {
      if (style()->styleType() != BEFORE)
          return false;
      // Text nodes don't have their own styles, so ignore the style on a text node.
      if (isText() && !isBR())
          return false;
      return true;
  }
  
  inline bool RenderObject::isAfterContent() const
  {
      if (style()->styleType() != AFTER)
          return false;
      // Text nodes don't have their own styles, so ignore the style on a text node.
      if (isText() && !isBR())
          return false;
      return true;
  }
  
  inline bool RenderObject::isBeforeOrAfterContent() const
  {
      return isBeforeContent() || isAfterContent();
  }
  
  // setNeedsLayout() won't cause full paint invalidations as
  // setNeedsLayoutAndFullPaintInvalidation() does. Otherwise the two methods are identical.
  inline void RenderObject::setNeedsLayout(MarkingBehavior markParents, SubtreeLayoutScope* layouter)
  {
      TRACE_EVENT_INSTANT1(
          TRACE_DISABLED_BY_DEFAULT("devtools.timeline.invalidationTracking"),
          "LayoutInvalidationTracking",
          "data",
          InspectorLayoutInvalidationTrackingEvent::data(this));
      ASSERT(!isSetNeedsLayoutForbidden());
      bool alreadyNeededLayout = m_bitfields.selfNeedsLayout();
      setSelfNeedsLayout(true);
      if (!alreadyNeededLayout) {
          if (markParents == MarkContainingBlockChain && (!layouter || layouter->root() != this))
              markContainingBlocksForLayout(true, 0, layouter);
      }
  }
  
  inline void RenderObject::setNeedsLayoutAndFullPaintInvalidation(MarkingBehavior markParents, SubtreeLayoutScope* layouter)
  {
      setNeedsLayout(markParents, layouter);
      setShouldDoFullPaintInvalidation();
  }
  
  inline void RenderObject::clearNeedsLayout()
  {
      setNeededLayoutBecauseOfChildren(needsLayoutBecauseOfChildren());
      setLayoutDidGetCalledSinceLastFrame();
      setSelfNeedsLayout(false);
      setEverHadLayout(true);
      setPosChildNeedsLayout(false);
      setNeedsSimplifiedNormalFlowLayout(false);
      setNormalChildNeedsLayout(false);
      setNeedsPositionedMovementLayout(false);
      setAncestorLineBoxDirty(false);
  #if ENABLE(ASSERT)
      checkBlockPositionedObjectsNeedLayout();
  #endif
  }
  
  inline void RenderObject::setChildNeedsLayout(MarkingBehavior markParents, SubtreeLayoutScope* layouter)
  {
      ASSERT(!isSetNeedsLayoutForbidden());
      bool alreadyNeededLayout = normalChildNeedsLayout();
      setNormalChildNeedsLayout(true);
      // FIXME: Replace MarkOnlyThis with the SubtreeLayoutScope code path and remove the MarkingBehavior argument entirely.
      if (!alreadyNeededLayout && markParents == MarkContainingBlockChain && (!layouter || layouter->root() != this))
          markContainingBlocksForLayout(true, 0, layouter);
  }
  
  inline void RenderObject::setNeedsPositionedMovementLayout()
  {
      bool alreadyNeededLayout = needsPositionedMovementLayout();
      setNeedsPositionedMovementLayout(true);
      ASSERT(!isSetNeedsLayoutForbidden());
      if (!alreadyNeededLayout)
          markContainingBlocksForLayout();
  }
  
  inline bool RenderObject::preservesNewline() const
  {
      if (isSVGInlineText())
          return false;
  
      return style()->preserveNewline();
  }
  
  inline bool RenderObject::layerCreationAllowedForSubtree() const
  {
      RenderObject* parentRenderer = parent();
      while (parentRenderer) {
          if (parentRenderer->isSVGHiddenContainer())
              return false;
          parentRenderer = parentRenderer->parent();
      }
  
      return true;
  }
  
  inline void RenderObject::setSelectionStateIfNeeded(SelectionState state)
  {
      if (selectionState() == state)
          return;
  
      setSelectionState(state);
  }
  
  inline void RenderObject::setHasBoxDecorationBackground(bool b)
  {
      if (!b) {
          m_bitfields.setBoxDecorationBackgroundState(NoBoxDecorationBackground);
          return;
      }
      if (hasBoxDecorationBackground())
          return;
      m_bitfields.setBoxDecorationBackgroundState(HasBoxDecorationBackgroundObscurationStatusInvalid);
  }
  
  inline void RenderObject::invalidateBackgroundObscurationStatus()
  {
      if (!hasBoxDecorationBackground())
          return;
      m_bitfields.setBoxDecorationBackgroundState(HasBoxDecorationBackgroundObscurationStatusInvalid);
  }
  
  inline bool RenderObject::boxDecorationBackgroundIsKnownToBeObscured()
  {
      if (m_bitfields.boxDecorationBackgroundState() == HasBoxDecorationBackgroundObscurationStatusInvalid) {
          BoxDecorationBackgroundState state = computeBackgroundIsKnownToBeObscured() ? HasBoxDecorationBackgroundKnownToBeObscured : HasBoxDecorationBackgroundMayBeVisible;
          m_bitfields.setBoxDecorationBackgroundState(state);
      }
      return m_bitfields.boxDecorationBackgroundState() == HasBoxDecorationBackgroundKnownToBeObscured;
  }
  
  inline void makeMatrixRenderable(TransformationMatrix& matrix, bool has3DRendering)
  {
      if (!has3DRendering)
          matrix.makeAffine();
  }
  
  inline int adjustForAbsoluteZoom(int value, RenderObject* renderer)
  {
      return adjustForAbsoluteZoom(value, renderer->style());
  }
  
  inline double adjustDoubleForAbsoluteZoom(double value, RenderObject& renderer)
  {
      ASSERT(renderer.style());
      return adjustDoubleForAbsoluteZoom(value, *renderer.style());
  }
  
  inline LayoutUnit adjustLayoutUnitForAbsoluteZoom(LayoutUnit value, RenderObject& renderer)
  {
      ASSERT(renderer.style());
      return adjustLayoutUnitForAbsoluteZoom(value, *renderer.style());
  }
  
  inline void adjustFloatQuadForAbsoluteZoom(FloatQuad& quad, RenderObject& renderer)
  {
      float zoom = renderer.style()->effectiveZoom();
      if (zoom != 1)
          quad.scale(1 / zoom, 1 / zoom);
  }
  
  inline void adjustFloatRectForAbsoluteZoom(FloatRect& rect, RenderObject& renderer)
  {
      float zoom = renderer.style()->effectiveZoom();
      if (zoom != 1)
          rect.scale(1 / zoom, 1 / zoom);
  }
  
  inline double adjustScrollForAbsoluteZoom(double value, RenderObject& renderer)
  {
      ASSERT(renderer.style());
      return adjustScrollForAbsoluteZoom(value, *renderer.style());
  }
  
  #define DEFINE_RENDER_OBJECT_TYPE_CASTS(thisType, predicate) \
      DEFINE_TYPE_CASTS(thisType, RenderObject, object, object->predicate, object.predicate)
  
  } // namespace blink
  
  #ifndef NDEBUG
  // Outside the WebCore namespace for ease of invocation from gdb.
  void showTree(const blink::RenderObject*);
  void showLineTree(const blink::RenderObject*);
  void showRenderTree(const blink::RenderObject* object1);
  // We don't make object2 an optional parameter so that showRenderTree
  // can be called from gdb easily.
  void showRenderTree(const blink::RenderObject* object1, const blink::RenderObject* object2);
  
  #endif
  
  #endif // RenderObject_h
  